Manufacture of primary disazodyestuffs and their production



Patented Mar. 13, 1934 UNITED STATES 1,950,952 PATENT OFFICE MANUFACTURE OF PRIMARY DISAZO- DYESTUFFS AND THEIR PRODUCTION Bernhard Richard, Basel, Switzerland, assignor to the firm of J. R. Geigy S. A., Basel, Switzerland No Drawing. Application May 31, 1932, Serial No. 614,617. In Switzerland October 11, 1931 8 Claims.

7 Diazo-compounds of aminoarylsulphonamides have not hitherto been used for the synthesis of primary disazo-dyestuffs from peri-aminohydroxynaphthalene sulphonic acids. By the present invention valuable dyestufis of this group are made by coupling one molecular proportion of the diazo compound of an aminoarylsulphonamide, which may contain in the sulphonamide group one or two, eventuallysubstituted hydrocarbon residues, in acid solution with a peri-aminohydroxynaphthalene sulphonic acid so as to produce a monoazo-dyestufi and then combining the monoazo dyestuii with a second molecular proportion of any desired diazo compound in an alkaline medium to produce a diazo-dyestufi. The

diazo compounds of aminoarylsulphonamides combine very well with the peri-aminohydroxynaphthalene sulphonic acids even in a strongly acid solution.

By suitable choice of the diazo compounds it is possible to obtain dyestuffs which yield on wool dyeings which excel in respect of their fastness to fulling those of the hitherto known primary disazo-dyestuffs. The new dyestuffs have the 101- lowing general formula:

i ILL-X2 on NH: o= t=o wherein A represents a residue of a benzene or naphthalene derivative, V represents H or SOaNa, R may be substituted or not, X1 represents H or alkyl and X2 represents H, alkyl, aralkyl, aryl, arylsulphonic acid. They dye wool and silk fast reddish-blue to greenish-blue and blue-black shades and are absorbed very well even from a neutral dye bath containing Glauber salt.

The following examples illustrate the invention:

Example 1 C. and whilst well stirring a diazo-solution prepared from 25.2 kilos of l methyll-aminobenzene-Z-sulphanilide. the whole is heated and the dyestufi is salted out, filtered and dried.

Naturally the second combination can be conducted, without isolating the monoazo-dyestuff, in presence of an excess of sodium carbonate solution directly after the acid coupling and after neutralization of the reaction mixture with caustic soda or sodium carbonate.

The dyestuff obtained in accordance with this example has the following formula:

It is a bronze powder which dissolves in water to a blue solution and in concentrated sulphuric acid to a green solution. It dyes wool blue-black shades of excellent fastness to fulling and of very good fastness to light.

Example 2 The diazo-compound prepared from 26.3 kilos of the para-toluene sulphonic ester of the 1- aminol-hydroxy-benzene is allowed to flow at 0-5 C. and whilst well stirring into an aqueous solution of the monoazo-dyestuff prepared as described in Example 1 containing an excess of sodium carbonate and 25 kilos of ammonia of 25 per cent strength. When coupling is complete the dyestuff is isolated in the usual manner. The new dyestuff has the following formula:

on NHZ n (his N-H Jails When dried it constitutes a bronze powder which is readily soluble in water to a blue solution and soluble in concentrated sulphuric acid to a green solution. It dyes wool reddish blue-black shades of very good fastness to fulling and to light; it is absorbed Well from a neutral dye-bath containing Glauber salt.

Example 3 31 kilos of 1-chloro-4-aminobenzene-2-sulpho- N-ethylanilide (a crystalline substance of melting point 119 C., obtainable by reducing 1- chloro-4-nitro-benzene-2-sulpho-N-ethylanilide) are diazotized and the diazo solution is introduced When coupling is complete,

into a suspension of 31.0 kilos of freshly predisulphonic acid whilst well stirring. When the coupling, which proceeds in the strongly acid dyestuif salted out, separated by filtration and dried. The new dyestufi has the formula:

OH NH:

medium at ordinary temperature, is completed, ON=N either the monoazo-dyestuff is isolated and redissolved for further combination in water, an SOaNa- SO Na excess of sodium carbonate and 20 kilos of am- CH3 monia of 25 per cent strength, or the acid reaction mixture is neutralized directly with caustic soda solution or sodium carbonate and then mixed with an excess of sodium carbonate and 20 kilos of It constitutes a bronze powder which dissolves in ammonia of 25 per cent strength. water to a blue solution and in concentrated sul- A diazo solution prepared form 19.9 kilos of phuric acid to a green solution; it dyes wool 2-amino-2-methyldiphenyl-ether is then algreenish blue-black shades of excellent fastness lowed to run gradually at 5-10 0. and whilst well to fulling and very good fastness to light. stirring'into the alkaline solution of the mono- The following table shows a number of other azo-dyestufi prepared by either of the aforesaid dyestufis obtainable in accordance with the inmethods. When coupling is complete the whole vention and the shades of their dyeings on is stirred for several hours, then heated and the wool:

Dyestufi from- Dyeing on wool Cou led with- The diazo compound and the diazo p m an 801d bath (acid medium) ofcompound (alkaline medium) of (1) l-chloro-Z-amino-benezene-4-sulphamide 4-chloro-2-amino-diphenyl-ethen.l l-a1nino-8-hydroxynaphthalene- Greenish blue- 3:6-disulphonic acid. black. (2) l-chloro-2-ammo-benzene-4-sulpho-d1- do do Do.

metbylamide. (3) 1 1-4-amino-benzene-z-sulpliamlide do Bluelac (4) 1-aminobenzene-3-sulphanilide o Do. (5) l-methyl-4-amiuo-benzene-2-sulphamhde. l-methyl-4-aminobenzene-2-sulpl1- D am 1 e. (6) lhlom-2-amino-benzenel-sulphanilide do do Do. (7) Do 2-amino-2'-methyl-diphenyl-ethern do Greenish blu black. Z-chIorc-I-amino-benzene "do Blue-black. (9) 4-chloro-2-amino-diphenyl-ether.. do Greenish blueno black. (10) 1-chloro-2-emino-benzene-4-sulpho-2- 2-amino-2-methyl-diphenyl-ethern do Do.

' methoxyanilide. 11) 1-c1 10r0-2-am1110-benzene-4-sulphan1l1del-amino-diphenyl-ether do Greenish blackbl (12) 1-chloro-2-amino-benzene-4-sulpho-mon0- p-toluene-sulphonic acidesterof 1- do R dt i i sh blue benzylamide. amino-4-hydroxy-benzene. bla k, 1 1 (13) 1-chloro-2- am1no-benzene-4-sulpl10-4- Para-toluene sulphonic acid ester do Do.

methyl-amlrde. of 1-amino-4-hydroxy-benzene. (14) 1-chloro-2-am1no-benzene-4-sulpho-N-ethyl- 4-cl1loro-2-amino-dipheny1-ether. d0 Greenish blueanilide (melting point ll2.5 C.) blac (15) Do p toluene-sulphonic-ester of 1- do Blue-black.

- aminoi-hydroxybenzene. (16) Do i 2-ami11o-2-methyl-pheny1 ether-.. do Greenish blue- 0 black. 12 7 l-chloro-4-am1no-benzene-2-sulphamllde do do D0.

(melting point 152 C.) j (18) Do Para-toluenesulphonic ester of 1- do Reddish blueamino-4-hydroxybenzene. black. (19) l-chlOlO-i-filnlnO-bQHZQHG-Z- UlDhO-N-Ethlfldo do D0,

anilide (melting point 119 C.) (20) Do 2-amino-2-methyl-diphenyl-ether do Greenish blue- (21) i-methoxy-z-aminobenzene-4-sulphanilide do d0 131 33355. (22) 2 ammo 4 methyl d1phenylsulphon e Para-toluene-sulphonic ester of do Do.

4-sulpho-N-ethyl-an1l1de (melting pomt 1-amin0-4-hydroxybenzene, l07l08 0. obtained by condensation of 2-nitro-1-chlorobenzene-i-sulpho-N-ethylanilide with paratoluene-sulphinic acid 2 and subselouenttrgdiictiong. 1 1 h 23 -ami no- -me y ip eny sup one- 2-chloro-1-amino-benzene l 1 iesulpho-N-ethyl anilide (melting point ereeallsh blue 107108 0. obtained by condensation of 2-nitro-l-chloro-benzene-4-sulpho-N-ethylanilide with paratoluene-sulphinic acid and subsequent reduction), (24) 1-chlor0-2amino-benzene-4-sulphanilide B-naphthyl-amine do Do. 35 Do a-naphthyl-amine do Green-black. (26) 1-chloro-2-am mo-benzene-4-sulphfln1l1de. 2-amino-2-methyl-diphenyl-ethcr. Lamino-8-hydroxy-naph Blue-black.

4:6-disu1 honic acid. (27) l-methyl-4-ammo-benzene-Z-sulphanflrde. 4-chloro-?ra1nino-diphenyl-etl1er do Reddish bluel k. 2 Do; 1-methyl-4-amino benzene 2- 1o b o.

sulphanilide. (29) 1-chloro-2-ammo-benzene-4-sulphaml1de-... 2-amino-l diphenyletherl-sul- 1-amino-8-hydroxy-naphthalene- Reddishblack. phonic 801d 4-monosulphonic acid. (30) 1-chloro-2:am1no-benzene-4-sulphaml1de-3- 4-chloro-2-am1no-d1phenyl-etherdo Do.

sulphomc acid. 7

NH: $0111 01 1 2 4 sol-NEG What I claim is:

lecular proportion of a peri-aminohydroxynaphthalene sulphonic acid in acid solution with a diazo compound of one molecule of an aminarylsulphonamide of the benzene series so as to produce a monoazo-dyestuff and then combining the latter with a second molecular proportion of an aromatic diazo compound in alkaline solution to produce a disazo-dyestuif.

2. A process for the manufacture of primary disazo-dyestuffs, consisting in coupling one molecular proportion of a peri-aminohydroxynaphthalene sulphonic acid in acid solution with a diazo compound of one molecule of an aminoarylsulphonamide of the benzene series which contains at least one alkyl, aralkyl or aryl radical of the benzene series in the sulphonamide group so as to produce a monoazo-dyestuff and then combining the latter with a second molecular proportion of an aromatic diazo compound in alkaline solution to produce a disazo-dyestufi.

3. A process for the manufacture of primary disazo-dyestuffs, consisting in coupling one molecular proportion of a peri-aminohydroxynaphthalene sulphonic acid in acid solution with a diazo compound of one molecule of an aminosulphonamide of the benzene series, in which one hydrogen of the sulphonamide group is replaced by a radical of the benzene series and the other hydrogen may be substituted by an alkyl, aralkyl or aryl radical, so as to produce a monoazo-dyestuff, and then combining the latter with a second molecular proportion of an aromatic diazo compound in alkaline solution to produce a disazodyestuff.

4. A process for the manufacture of primary disazo-dyestuffs, consisting in coupling one molecular proportion of a peri-aminohydroxynaphthalene sulphonic acid in acid solution with a diazo compound of one molecule of an aminoarylsulphonamide of the benzene series which contains two alkyl radicals, or two of the aralkyl and aryl radicals of the benzene series in the sulphonamide group so as to produce a monoazo-dyestuff and then combining the latter with a second molecular proportion of an aromatic diazo compound in alkaline solution to produce a disazo-dyestuff.

5. A process for the manufacture of a primary disazo-dyestuff, consisting in coupling 1-chloro-2- amino-benzene-4-sulphanilide in acid medium with 1-amino-8-hydroxynaphthalene-3 :6 disulphonic acid and combining the product obtained in alkaline medium with l-methyl-f-aminobenzene-Z-sulphanilide so as to produce a disazodyestuff having in form of its sodium salt the following formula:

6. A process for the manufacture of a primary disazo-dyestuff, consisting in coupling l-chloro- 2-amino-benzene-4-sulphanilide in acid medium with 1-amino-8-hydroxynaphthalene-3: fi-disulphonic acid and combining the product obtained in alkaline medium with the para-toluene sulphonic ester of 1-amino-4-hydroxybenzene so as to produce a disazo-dyestuff having in form of its sodium salt the following formula:

7. A process for the manufacture of a primary disazo-dyestuff, consisting in coupling l-chloro- 4 amino -benzene 2 sulpho -N- ethylanilide in acid medium with 1-amino-8-hydroxynaphtha- 1ene-3:6-disulphonic acid and combining the product obtained in alkaline medium with 2- amino-2-methy1dipheny1ether so as to produce a disazo-dyestuff having in form of its sodium salt the following formula:

0 H IITH:

SOaNa- -SOaNa O= =0 8. The primary disazo-dyestufi's having the following general formula:

wherein A represents a radical of the benzene or naphthalene series, V represents H or SO3Na, B may be phenyl, or phenyl substituted by alkyl, O-alkyl, halogen, SOzCsHs, or SOzCvHv, X1 represents H or alkyl and X2 represents H, aryl, aralkyl, arylsulphonic acid of the benzene series, said dyestuffs dissolving in water to a substantial blue solution and in concentrated sulphuric acid to a substantial green solution and dyeing wool and silk reddish-blue to greenish-blue and blue-black shades fast to fulling and to light.

BERNHARD RICHARD. 

